Facebook boasts millions of users, and it's statistically probable that your teacher is one of them. Unless your teacher specifically provides you with a link to her Facebook account or sends you a friend request, you'll have to search for her using Facebook's search tools. It helps to know a few things about your teacher before starting, such as workplace, educational information and location.
Log into Facebook and enter your teacher's name into the "Search" field at the top of the screen. A drop-down menu will appear with a few possibilities. Click "See More Results" at the bottom of the list.
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Click "People" on the left-side menu.
Click the "Location" drop-down menu and select "Workplace." Enter the school where your teacher works, such as the school you attend if you're searching for your current teacher, into the text field next to the drop-down menu, then press "Enter." You can also enter the city where she lives and where she went to school, assuming you know this additional information.
Scroll through the list of results for your teacher; it may take awhile to find the correct profile, especially if he doesn't use a picture of himself. If you find someone you think is your teacher, but you're not entirely sure, you can send that user a message by clicking the "Send Message" button.